394920685 has 4 divisors (see below), whose sum is σ = 473904828. Its totient is φ = 315936544.

The previous prime is 394920683. The next prime is 394920703. The reversal of 394920685 is 586029493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 92891044 + 302029641 = 9638^2 + 17379^2 .

It is a cyclic number.

It is not a de Polignac number, because 394920685 - 2¹ = 394920683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394920683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39492064 + ... + 39492073.

It is an arithmetic number, because the mean of its divisors is an integer number (118476207).

Almost surely, 2^394920685 is an apocalyptic number.

It is an amenable number.

394920685 is a deficient number, since it is larger than the sum of its proper divisors (78984143).

394920685 is an equidigital number, since it uses as much as digits as its factorization.

394920685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78984142.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 394920685 is about 19872.6114287982. The cubic root of 394920685 is about 733.6742789037.

It can be divided in two parts, 394920 and 685, that added together give a triangular number (395605 = T₈₈₉).

The spelling of 394920685 in words is "three hundred ninety-four million, nine hundred twenty thousand, six hundred eighty-five".